I have written a book on the e______此处应填什么?

i have a book on the desk A book was written on the subject.He has written a book on t 十万火急的英语问题：he has written a book the name of which i have for he has written a Book _____name i have forgotten. He has written a book,the name____I have completely forgotte I have a book on the desk改为同义句 I have a book on the desk .的同义词 I do have a book on I f什么 a book on the floor 16．The book is mine. I’ve written ______ name on _____ cover I have written the book since last year .的同义句 I have already written the letter.改为一般疑问句.written改为什么形式?